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81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* gskglbufferprivate.h
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*
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* Copyright 2020 Christian Hergert <chergert@redhat.com>
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*
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* This file is free software; you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 2.1 of the License, or (at your option)
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* any later version.
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*
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* This file is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#pragma once
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#include "gskgltypesprivate.h"
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G_BEGIN_DECLS
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typedef struct _GskGLBuffer
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{
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guint8 *buffer;
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gsize buffer_pos;
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gsize buffer_len;
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guint count;
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GLenum target;
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gsize element_size;
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} GskGLBuffer;
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void gsk_gl_buffer_init (GskGLBuffer *self,
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GLenum target,
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guint element_size);
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void gsk_gl_buffer_destroy (GskGLBuffer *buffer);
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GLuint gsk_gl_buffer_submit (GskGLBuffer *buffer);
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static inline gpointer
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gsk_gl_buffer_advance (GskGLBuffer *buffer,
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guint count)
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{
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gpointer ret;
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gsize to_alloc = count * buffer->element_size;
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if G_UNLIKELY (buffer->buffer_pos + to_alloc > buffer->buffer_len)
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{
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while (buffer->buffer_pos + to_alloc > buffer->buffer_len)
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buffer->buffer_len *= 2;
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buffer->buffer = g_realloc (buffer->buffer, buffer->buffer_len);
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}
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ret = buffer->buffer + buffer->buffer_pos;
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buffer->buffer_pos += to_alloc;
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buffer->count += count;
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return ret;
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}
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static inline void
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gsk_gl_buffer_retract (GskGLBuffer *buffer,
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guint count)
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{
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buffer->buffer_pos -= count * buffer->element_size;
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buffer->count -= count;
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}
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static inline guint
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gsk_gl_buffer_get_offset (GskGLBuffer *buffer)
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{
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return buffer->count;
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}
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G_END_DECLS
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